# Official Postmark MCP Server [](https://www.npmjs.com/package/@activecampaign/postmark-mcp) 
Send emails with Postmark using Claude and other MCP-compatible AI assistants.
## Features
- Exposes a Model Context Protocol (MCP) server for sending emails via your [Postmark account](https://account.postmarkapp.com/sign_up)
- Simple configuration via environment variables
- Comprehensive error handling and graceful shutdown
- Secure logging practices (no sensitive data exposure)
- Automatic email tracking configuration
## Useful Docs
- [📒 API Documentation](https://postmarkapp.com/developer)
- [🔎 API Explorer](https://postmarkapp.com/api-explorer)
- [📖 Engineering Articles](https://postmarkapp.com/blog/topics/engineering)
## Feedback
We'd love to hear from you! Please share your feedback and suggestions using our [feedback form](https://forms.gle/zVdZLAJPM81Vo2Wh8).
Follow us on X - [@postmarkapp](https://x.com/postmarkapp)
---
# Setup
## Requirements
- Node.js (v16 or higher recommended)
- A [Postmark account](https://account.postmarkapp.com/sign_up) and server token
## Installation (Local Development)
**Clone the repository:**
```sh
git clone https://github.com/ActiveCampaign/postmark-mcp
cd postmark-mcp
```
**Install dependencies:**
```sh
npm install
# or
yarn
# or
bun install
```
## Configuration (Local Development)
Create your own environment file from the example
```sh
cp .env.example .env
```
Edit your `.env` to contain your Postmark credentials and settings.
**Important:** This is intended for local development purposes only. Secrets should never be stored in version control and `.env` type files should be added to `.gitignore`.
| Variable | Description | Required |
|---------------------------|--------------------------------------------------|------------|
| POSTMARK_SERVER_TOKEN | Your Postmark server API token | Yes |
| DEFAULT_SENDER_EMAIL | Default sender email address | Yes |
| DEFAULT_MESSAGE_STREAM | Postmark message stream (e.g., 'outbound') | Yes |
**Run the server:**
```sh
npm start
# or
yarn start
# or
bun start
```
## Cursor Quick Install
After installing the MCP, update your configuration to set:
- `POSTMARK_SERVER_TOKEN`
- `DEFAULT_SENDER_EMAIL`
- `DEFAULT_MESSAGE_STREAM` (default: `outbound`)
## Claude and Cursor MCP Configuration Example
```json
{
"mcpServers": {
"postmark": {
"command": "node",
"args": ["path/to/postmark-mcp/index.js"],
"env": {
"POSTMARK_SERVER_TOKEN": "your-postmark-server-token",
"DEFAULT_SENDER_EMAIL": "your-sender-email@example.com",
"DEFAULT_MESSAGE_STREAM": "your-message-stream"
}
}
}
}
```
## Tools
This section provides a complete reference for the Postmark MCP server tools including example prompts and payloads.
### Table of Contents
- [Email Management Tools](#email-management-tools)
- [sendEmail](#1-sendemail)
- [sendEmailWithTemplate](#2-sendemailwithtemplate)
- [Template Management Tools](#template-management-tools)
- [listTemplates](#3-listtemplates)
- [Statistics & Tracking Tools](#statistics--tracking-tools)
- [getDeliveryStats](#4-getdeliverystats)
## Email Management Tools
### 1. sendEmail
Sends a single text email.
**Example Prompt:**
```
Send an email using Postmark to recipient@example.com with the subject "Meeting Reminder" and the message "Don't forget our team meeting tomorrow at 2 PM. Please bring your quarterly statistics report (and maybe some snacks).""
```
**Expected Payload:**
```json
{
"to": "recipient@example.com",
"subject": "Meeting Reminder",
"textBody": "Don't forget our team meeting tomorrow at 2 PM. Please bring your quarterly statistics report (and maybe some snacks).",
"htmlBody": "HTML version of the email body", // Optional
"from": "sender@example.com", // Optional, uses DEFAULT_SENDER_EMAIL if not provided
"tag": "meetings" // Optional
}
```
**Response Format:**
```
Email sent successfully!
MessageID: message-id-here
To: recipient@example.com
Subject: Meeting Reminder
```
### 2. sendEmailWithTemplate
Sends an email using a pre-defined template.
**Example Prompt:**
```
Send an email with Postmark template alias "welcome" to customer@example.com with the following template variables:
{
"name": "John Doe",
"product_name": "MyApp",
"login_url": "https://myapp.com/login"
}
```
**Expected Payload:**
```json
{
"to": "customer@example.com",
"templateId": 12345, // Either templateId or templateAlias must be provided, but not both
"templateAlias": "welcome", // Either templateId or templateAlias must be provided, but not both
"templateModel": {
"name": "John Doe",
"product_name": "MyApp",
"login_url": "https://myapp.com/login"
},
"from": "sender@example.com", // Optional, uses DEFAULT_SENDER_EMAIL if not provided
"tag": "onboarding" // Optional
}
```
**Response Format:**
```
Template email sent successfully!
MessageID: message-id-here
To: recipient@example.com
Template: template-id-or-alias-here
```
## Template Management Tools
### 3. listTemplates
Lists all available templates.
**Example Prompt:**
```
Show me a list of all the email templates available in our Postmark account.
```
**Response Format:**
```
📋 Found 2 templates:
• Basic
- ID: 12345678
- Alias: basic
- Subject: none
• Welcome
- ID: 02345679
- Alias: welcome
- Subject: none
```
## Statistics & Tracking Tools
### 4. getDeliveryStats
Retrieves email delivery statistics.
**Example Prompt:**
```
Show me our Postmark email delivery statistics from 2025-05-01 to 2025-05-15 for the "marketing" tag.
```
**Expected Payload:**
```json
{
"tag": "marketing", // Optional
"fromDate": "2025-05-01", // Optional, YYYY-MM-DD format
"toDate": "2025-05-15" // Optional, YYYY-MM-DD format
}
```
**Response Format:**
```
Email Statistics Summary
Sent: 100 emails
Open Rate: 45.5% (45/99 tracked emails)
Click Rate: 15.2% (15/99 tracked links)
Period: 2025-05-01 to 2025-05-15
Tag: marketing
```
## Implementation Details
### Automatic Configuration
All emails are automatically configured with:
- `TrackOpens: true`
- `TrackLinks: "HtmlAndText"`
- Message stream from `DEFAULT_MESSAGE_STREAM` environment variable
### Error Handling
The server implements comprehensive error handling:
- Validation of all required environment variables
- Graceful shutdown on SIGTERM and SIGINT
- Proper error handling for API calls
- No exposure of sensitive information in logs
- Consistent error message formatting
### Logging
- Uses appropriate log levels (`info` for normal operations, `error` for errors)
- Excludes sensitive information from logs
- Provides clear operation status and results
---
*For more information about the Postmark API, visit [Postmark's Developer Documentation](https://postmarkapp.com/developer).*
## License
[MIT](LICENSE) © ActiveCampaign